PROPOSED RESOLUTION: For issue #81, adopt proposal to have a
"getAvailability" method on NavigatorPresentation that returns a
Promise to get an AvailabilityListener (or observer) with a boolean
"available" property and an "availablechange" event. Promise is
rejected when user agent does not support background monitoring.
startSession triggers discovery. No requirement on frequency of
discovery (there may not be any in some period of time)
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GitHub Notif of comment by tidoust
See
https://github.com/w3c/presentation-api/issues/81#issuecomment-103817566